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Piracy has been soaring off the coast of eastern Africa, particularly Somalia, which has not had an effective government since 1991.

Somali pirates have defied foreign navies patrolling the waters and have collected large ransoms from shipping companies. Ransoms started out in the tens of thousands of dollars and have since climbed into the millions.

The Gulf of Aden, off the northern coast of Somalia, has the highest risk of piracy in the world. About 25,000 ships use the channel south of Yemen, between the Red Sea and the Arabian Sea.